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Fair Value Measurements - Non-Recurring Measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value      
Investment in unconsolidated entities $ 109,051 $ 118,861  
Impairment Loss      
Investment properties, total impairment loss 9,002 2,359 $ 3,510
Fair Value, Measurements, Nonrecurring      
Impairment Loss      
Investment properties, total impairment loss 9,002 2,359 3,510
Investment in unconsolidated entities, impairment loss 0 0 29,933
Total impairment losses 9,002 2,359 33,443
Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value      
Investment properties 5,500 42,250 64,075
Investment in unconsolidated entities $ 0 $ 0 $ 30,049